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Remove all the plugs and do a compression test on all cylinders. If compression is good then replace all plugs and plug wires one at a time. If you find one or more cylinders with low compression, suspect a burnt valve, or a possible blown head gasket, especially if you are loosing coolant. You may also have an injector that is malfunctioning. Start with the plugs and wires which probably need replacing anyway.
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On a 2002 Oldsmobile alero 2.2 liter engine how do you diagnose engine missing problem?
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What grade of oil is best in your 5.3 liter Chevy engine?"
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